Name of the shared isolation segment created at startup.
This field can be updated, but subject to the following caveat:
Using the name of an existing IS will cause a deployment to fail.
To recover, redeploy using the last valid Shared Isolation Segment name.

An organization that will be created as part of the seeding process. When the system_domain is not shared with (in the list of) app_domains, this is required as the system_domain will be created as a PrivateDomain in this organization.